Choosing an Indirect Water heater via MBTU/Hr rating

Dear Readers,
I'm trying to select an indirect water heater to retrofit my boiler
from a tankless coil. The literature for indirect water heaters lists
a Minimum Boiler Output (MBtu/hr.). Would this number be my boiler's
"DOE Heating Capacity" or my boiler's "NET I-B-R Ratings-Water"?
These are the only two ratings I can find for my boiler in MBtu/hr.
Any advise appreciated.
Anthony M. Falcone

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